Ninja Gaiden: Dragon Sword is set six months after the last Ninja Gaiden game on the Xbox.  Ryu Hayabusa has rebuilt the Hayabusa Village.  But, when fellow villager and kunoichi Momiji is kidnapped by the evil Black Star Ninja Clan, Ryu is forced to find her.  Along the way, he uncovers the secrets behind the mysterious Dark Dragonstones and their relation to the Dragon Lineage.